一位在美国印第安纳州的网友拍下了这个奇异的天空变化,很明显:有人在天空上开派对 (误)。在影片中,太阳很明显被云朵遮住,却有奇妙的光线不停地闪烁。让我们先来看看这个奇景:
上头就像是有派对灯是有个灯塔闪烁个不停,但如果就依照科学角度来解释,这应该是个叫做幻日 (sundog) 的现象。
![](http://teepr.com/wp-content/uploads/2015/06/Sundog.gif)
这是一种大气光学的现象,因为天空中漂浮着大量的冰晶,进而折射太阳的光线,所以真实太阳的两侧约22度角折射制造出两个太阳的虚像。曾经在蒙古还一次看过5个太阳的情况。
![Sundogs are created when sunlight is refracted by large, hexagonal ice crystals, such as those in snowflakes. Shown is one over Fargo, North Dakota. They typically appear as two coloured patches of light either side of the sun and though rare, can in theory be seen anywhere in the world in any season](http://teepr.com/wp-content/uploads/2015/06/29E54A1000000578-3136061-Sundogs_are_created_when_sunlight_is_refracted_by_large_hexagona-a-42_1435065735223.jpg)
这个现象的出现是取决于卷云的密度、厚度、高度、以及观察者的位置等。当高空状况改变的时候,晶体也会以不同的角度来折射太阳光,进而也会让光线有跳动的感觉。
![The scientific explanation for what is going on is almost certainly linked to an atmospheric explanation known as a sundog. This occurs when a luminous halo ring appears around the sun, when light interacts with ice crystals in the atmosphere. A diagram of the jumping sundog effect is shown](http://teepr.com/wp-content/uploads/2015/06/29E69A7800000578-3136061-The_scientific_explanation_for_what_is_going_on_is_almost_certai-a-36_1435079639917.jpg)
这样的光学现象虽然罕见,但也有机会出现在世界各处,只要光线通过高空冰冷云朵当中的冰晶折射,就有机会看到。
![The video of jumping sundogs was filmed above Greenwood, Indiana. It shows a beam of light flickering among some clouds and moving. The effect is due to electric fields changing in the sundog. This occurs when light from the sun reflects in a certain way. The beam of light can be seen here in the middle](http://teepr.com/wp-content/uploads/2015/06/29E4402200000578-3136061-A_video_of_jumping_sundogs_was_filmed_above_Greenwood_Indiana_It-a-40_1435065611761.jpg)
来源:Daily Mail
来人啊!音乐请下:大自然真奇妙~就看你有没有注意到~(泄漏年龄惹…)
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